Rare 1996 & 1986 1987 1988 1990 1991 1993 1994 1995 PRESTIGE SILVER PROOF SETS. 1987: half dollar has small circular discoloration. 1988: silver dollar had some discoloring. 1996: silver dollar has some discoloring along one edge. 1994: silver dollar has some discoloring. I dont know how these have discolored, boxes were never tampered with and all stored the same. The item "Rare 1996 & 1986 1987 1988 1990 1991 1993 1994 1995 PRESTIGE SILVER PROOF SETS" is in sale since Thursday, April 4, 2019. This item is in the category "Coins & Paper Money\Coins\ US\Proof Sets". The seller is "doc_op" and is located in Lakeland, Florida.